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    Trying to identify a film back.

    I have a camera with a back on it which is designed to take a film holder which slides into a recess which is 3 5/8" wide and 1/16" thick - the holder must be in the region of 5 3/16" long (give or...
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    Re: Wet plate collodion spectral sensitivity?

    Thanks all, especially Nodda Duma (apparently very helpful). I have forwarded links and info and my friend is now looking at glass types with help from retired lens designers too. I think that he's...
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    Re: Information sought on a lens by C Burr, London

    Looks fairly similar but they are not identical - mine is 2" in diameter and never had a hood (no provision for one). I get 2 reflections from the front and 2 from the rear. I wonder if Mr Burr was a...
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    Re: Information sought on a lens by C Burr, London

    Yes. Tying specific photos to being taken on specific lenses during the 1850/60s is not easy, but I have certainly found a few, or have discovered specific photographers/locations/dates which I am...
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    Re: Information sought on a lens by C Burr, London

    Could you tell me the physical dimensions of your lens please?
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    Re: Information sought on a lens by C Burr, London

    Thanks Andrew. I hadn't looked at the VM as yet. The lens has no engraved specifications, nor address. Going from online info I'm thinking it may be a 'widish' RR from the 1870s?
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    Re: Information sought on a lens by C Burr, London

    August 15th 1860:
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    Information sought on a lens by C Burr, London

    I picked up, cheaply enough, what I thought was probably a Rapid Rectilinear lens by C Burr, of London. With a little persuasion it disassembled and after having cleaned decades of caked on muck off...
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    Re: Wet plate collodion spectral sensitivity?

    Thanks, it does and I've sent on the link.
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    Re: Wet plate collodion spectral sensitivity?

    I'd have thought it basic data myself (but then I have a photo science background) and having searched I've found some data, but I'm a bit dubious about some of its assumptions. I thought that...
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    Wet plate collodion spectral sensitivity?

    Can anyone tell me what the spectral sensitivity would have been like back in the 1850/60s. Was collodion simply just blue sensitive. I ask because I have a friend doing some lens software modelling...
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    Re: Fungus on antique Lens: Can it be fixed?

    And just to illustrate this further, here is a shot taken on an 1859 lens (using a step and repeat digital back I am building on a Gandolfi) and then stitched and processed in Photoshop) which,...
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    Re: Fungus on antique Lens: Can it be fixed?

    If you intend to use the lens then try it out before doing anything else. I have been using old lenses with many optical faults including balsam separation, scratches, yellowing of the balsam and so...
  14. Re: Lensboards for Macro Stereo :confused::confused::confused:

    Well, I have one of a pair of stereo lenses from the mid/late 19th century which came on a 'half-board' that was clearly intended to be adjusted. I assume that it was so that the inter lens distance...
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    Re: Show off your Large Format camera!

    Indeed you do. As it happens I know a lens designer who knows who designed the 210mm f/6.8 so I have been informed that it dates from '72-'75. It is a simple symmetrical double gauss type lens of 4...
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    Re: Show off your Large Format camera!

    Here's one of mine - a Welsh made Nesbitt along with 2 x Welsh made PPE lenses. A long term project which I might eventually sort out - the camera takes MPP lens boards which is handy. (the taking...
  17. Re: Online Reference for overview of Darlot Lenses?

    I rather like 'patina' as it suggests that the item has been used, and hopefully enjoyed. I don't refurbish things but do try to ensure that they works as intended.
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    Re: Antique Lens research

    British ones tend to reflect the fact that photography was undertaken by the wealthy and photographic societies were almost thought of as 'learned bodies'. That said there is some very interesting...
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    Re: Antique Lens research

    It is, but be aware that Kingslake does not seem to have had access to things like all volumes of the Photographic Journal (see my post above) so his history is sometimes not as absolute as it might...
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    Re: Antique Lens research

    I've been researching into old lenses myself. The problem compared to say Leica, is often lack of factory records, the fact that many optical firms operated for a short time and few other easily...
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    Re: Going crazy! Looking for a 3/8 female thread?

    I have found that in order to stop an Arca plate twisting its best to use one with a slot rather than a hole and then use 2x screws to hold it in place. Doing so allows you to use 1/4-20 because you...
  22. Thread: Dating Derogy lens

    by pgk
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    Re: Dating Derogy lens

    It would be interesting to create a table showing comparative serial numbers/date/manufacturer if for no other reason than to understand just how large the market was for lenses in the early years of...
  23. Re: HERMAGIS 440mm Aplanat No.4 Series II - and iris as f numbers - little help

    Might be worth looking at: http://www.earlyphotography.co.uk/site/lens_diaphragm.html
  24. Re: Which lenses did Carleton Watkins use in 1861 for his mammoth plate camera

    In case anyone is interested, there is a contemporary report (August 15th 1863) on the Globe lens here: https://archive.rps.org/archive/volume-8/724646-volume-8-page-169?q=Grubb%20globe (and complete...
  25. Re: Which lenses did Carleton Watkins use in 1861 for his mammoth plate camera

    Fascinating. Looks like I need to do more digging. And FWIW one of the things I have found out is that patent law in Britain changed in 1852 making it easier to patent inventions. I suspect that this...
  26. Re: Which lenses did Carleton Watkins use in 1861 for his mammoth plate camera

    Well, sometimes the photographer was very helpful. Samuel Bourne of Simla shot snowscapes in the Himalayas in 1865, and at 18,600 feet (highest altitude for photography at the time) and noted in his...
  27. Re: Which lenses did Carleton Watkins use in 1861 for his mammoth plate camera

    The problem from my point of view is that there is information which mentions specific lenses but I find it difficult to find any confirmation of any claims. My interest is trying to see how...
  28. Re: Which lenses did Carleton Watkins use in 1861 for his mammoth plate camera

    Yes, but. the Harrison and Schnitzer wasn't patented until 1862 and Dallmeyer only started making lenses in late 1860 (mostly stereo from what I can find out so far and his Triple Achromat seems to...
  29. Which lenses did Carleton Watkins use in 1861 for his mammoth plate camera

    I'm currently researching a number of photographers and trying to tie them into to the existent optical technology of their time. Whilst this question has been asked before, I'm interested in what...
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    Re: Identifying Bellows Peco Universal III

    I spoke to someone at custombellows.co.uk about a Gandolfi bellows I needed. "we used to make them for Gandolfi" he said "which model, we may have it from stock?". I described it and said I'd pop the...
  31. Re: Who first used Helical Focusing for a photo lens?

    Thanks but I'm at 1863/4 so far but just wondering if that was the first date?
  32. Who first used Helical Focusing for a photo lens?

    An odd question I know, but does anyone know who first used a helicoid to focus a photographic lens and when?
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    Re: Quarantine Pictures Any Format

    Fabulous weather here in Scotland, but staying in the garden. Time to dig out a camera nearing being usable (new bellows, lens mounted) and even if I can't use it yet, it is looking nice.
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    Re: Need Grubb Lens Expertise

    Both look modified to me. It would be essential to check that both have the serial number micro-engraved on the lens glass in order to determine just how unoriginal either actually is.

    Edit....
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    Re: Visit London and its Vicinity

    Both are fascinating. I used to live near Bath many years ago - amazing architecture. The Cotswolds are pretty but you will need a car to explore them thoroughly. You wll find plenty on line about...
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    Re: Visit London and its Vicinity

    The obvious central London one is probably The Photographers' Gallery (https://thephotographersgallery.org.uk/) but its hit and miss about Large Format - good bookshop in the basement and the cafe's...
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    Re: Lensboard for Linhof Color

    Thanks Bob. From your previous posts I thought that you might know and respond.
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    Lensboard for Linhof Color

    I just bought this camera (the original Color not the Kardan Color) cheaply, basically for its rotating back which I can adapt. That said the camera is described as being in working order and the...
  39. Re: Likely Very Naive Question, sheet film then scan to produce a digital print.

    If for no other reason, for the sheer delight of using very old lenses as they were designed to be used - to throw a very large image. This is not reproducible using any digital system as yet. Having...
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    Re: What is the purpose of this baffle?

    I doubt this simply because I cannot see how it would work with the constraints of size and lenses. Also, other Moorse cameras seem to have a similar front with no provision for bigger/smaller lens...
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